Denon HEOS AMP Wireless Amplifier (Black and Gunmetal) (New Version), Works with Alexa Compatible with Alexa, Siri and Google Assistant voice control Plays high resolution audio;Frequency response 20 Hz to 20 kHz Bluetooth integrated Turn any speakers into a wireless zone. Operating temperature range - 41 degree to 95 degree fahrenheit Features the same wireless ease of use as our self-powered HEOS speaker models Featuring advanced Class D digital amplification in a sleek compact chassis